Improvement in wood-screws



E. A. LELAND. WOOD-SCREW.

No.178,39. Patented June 6,1876.

L W; v 63%;. 41 Mg UN TED STATES EDWIN A. LELAND, OF NEW YORK, ASSIGNOR TO LEONARD RICHARDSON,

' OF BROOKLYN, N. Y.

IMPROVEMENT IN WOOD-SCREWS.

pecification forming part of Letters Patent No. 178,309, dated June 6, 1876; application filed February 15, 1876.

To all whom it may concern Be it known that I, EDWIN A LELAND, of the city, county, and State of New York, have invented an Improvement in Wood-Screws, of which the following is a specification:

This invention consists of a wood-screw, the nick or groove in the head of which is serrated at its bottom in such manner that a screwdriver correspondingly serrated at its end or holding edge, will be kept from slipping laterally from the nick or groove aforesaid in the operation of driving the screw.

Figure l is-a sectional view of a screw made according to my invention. Fig. 2 is a plan view of the same.

The shank A of the screw is threaded in the usual or in any suitable manner, and, in

general, and with the exception hereinafter specifically set forth, the head B may be of any shape'ordinaril y adopted for Wood-screws, the said head B being provided with the nick a, formed in the process or operation of manut'acture by any known usual or suitable means. But this nick 0,, instead of having a smooth flat bottom, as is the case with the common wood-screw, has its bottom serrated or corrugated, as represented more fully in Fig. 1, the alternating notches a and ridges b which make up the serrated or corrugated bottom, as aforesaid, of the nick or groove, being transverse to the latter, so that when a screw-driver, shown in Fig. '1, provided at its edge or holding end with alternating notches and projections, (in other Words, made serrated,) is inserted in the nick a inthe operation of driving the screw, the projections of the serrated edge of the driver will alternate with The wood-screw, having the bottom of its Y nick or groove a serrated or corrugated, substantially as and for the purpose set forth.

EDWIN A. LELAND.

Witnesses:

- JAMES A. WHITNEY,

THOMAS C. CONNOLLY.

PATENT OEEIcE. 

